Father called for a knife (6)
I believe the answer is:
parang
'a knife' is the definition.
(parang is a kind of knife)
'father called' is the wordplay.
'father' becomes 'pa' (pa is a kind of father).
'called' becomes 'rang' ('ring' can be a synonym of 'call').
'pa'+'rang'='PARANG'
'for' is the link.
(Other definitions for parang that I've seen before include "Heavy Malay knife" , "Dyak of Borneo's knife" , "Knife used by Dyaks of Borneo" .)